Automatic tire-alarm.



'A. T. JOHNSON. AUTOMATIC TIRE ALARM.

APPLICATION FILED NOV-24, I914.

1,177,630. v Patented Apr; "11, 1916.

O Attorneys,

lnvento'r,

UmED STATEg Pieil fihl l ARCHIE T. JOHNSON, OF EAST LAS VEGASQN ormon I anxrco.

AUTOMATIC TIRE-ALARM.

Specification of Letters Patent.

Patented Apr. 4:, 1916.

Application filed November 24, 1914. Serial 1%. 873,767.-

Las Vegas, in the county of San Miguel and State'ot' New Mexico, have invented a new I and useful Automatic Tire-Alarm, of which the following is a specification.

The present invention relates to improvements in auto tire alarms, one obje t of the invention, being the provision of an automatic device adapted to be attached to the valve stem of an inner tube of a pneumatic tire and provided with means to actuate the valve thereof to fully open the same when the pressure has been reduced in the inner tube to a predetermined degree so that the air emitted or released from the tire will actuate an audible alarm, asfor instance whistle, to indicate to the owner that the tire needs replenishing.

A further object of the present invention, is the provision of a simple and inexpensive device of this character which is readily at tached and locked in place upon the valve stem of a pneumatic tire and in which all parts are properly clamped against rattling or removal.

l/Vit-h the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawings l igure 1 1s a side elevation of a valve stem equipped with the present signal. Fig. 2 is a longitudinal sectional view through the present attachment and the adjacent portion of the valve stem, portions of the whistle also being shown in section. v

Referring to the drawings, the numeral 1 designates the usual tubular stem attached to the inner tube of an automobile tire, which is provided with the depressible valve stem 2 accessible through the exteriorly threaded and reduced end 3 of the stem. This structure issuch that by depressing the stem '2, the valve (not shown) within the stem 1 will be openedso, as to permit of the release of the air within the tire.

Fitting upon the exteriorly threaded end 3 of the stem 1 is a sleeve 4, which in reality ting the lower the reception of the adjustable bushing or member 6, which is provided with the air "outlet 7, so that air admitted through the stem 1 will be ted therethrough. Abutad of the member 6, is a coiled spring 8., i tension of which is ad'- just d by tie a stability of the member (3, the lower e1 ereof resting upon member 9 to hold t .alve stem engaging the member 9 in with its lower SOCliQtGCl end over the e on 10 of the stem 2 and resting against ointment 11 thereof. Thus it will be seen by adjusting the member r e spring relative to the justed, so that when the tire {not shown) is such as to nor: the valve controlled by the stem '1 re spring 8 will he inm e v enective. ever, should the pressure within spring 8 shown) cc 2 will be dep thereby will lease of through the o ate the audible provided with sleeve 12 ror a portion of the i in order to the whistle l3 in position so that the same Wlll not become loose during the rotation ofthe wheel, a tuhular casing llsurroundsthe casing 4 and threaded-ly engages at its lower end, the threaded portion of the stem 1', while the upper end engages under the flange portion of the whistle 13, so that the looking member 15 disposed upon the threaded portion of the stem 1 may be adjusted to bear against the lower end'thereof and thus lock the parts firmly in position.

From the foregoing description, it is evi+ dent that the present device may be easily attached to the inner tube valve stems now in use, by merely displacing the usual cap therefor, the member 6 being adjusted to regulate the'tension of the spring so that the valve stem of the inner tube tire will be actuted to open the valve as soon as the tire has leaked and the pressure has been reduced to a predetermined degree. Thus it will be seenthat the alarm 13 will be actuated betore any damage can be done thetire Mine to rim cutting and the like Where tires re Kidfll with the pressure reduced to a 2* degr e. 1

i eiaizned is:

iii alarm comprising a sleeve having eno threaded to engage the end of a tire whistle threaded upon the other end sieeve; an epertured adjusting elethreaded Within the sleeve, an element tnbear against a Valve stem, e coiled spring he zween said elements and e iubuier casing 

